remove unused code

app/src/main/java/com/google/samples/apps/nowinandroid/ui/NiaApp.kt

@@ -49,7 +49,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
-import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
 import com.google.samples.apps.nowinandroid.core.ui.component.NiaBackground
 import com.google.samples.apps.nowinandroid.core.ui.theme.NiaTheme
@@ -67,8 +66,6 @@ fun NiaApp(windowSizeClass: WindowSizeClass) {
             NiaTopLevelNavigation(navController)
         }
 
-        val navBackStackEntry by navController.currentBackStackEntryAsState()
-
         NiaBackground {
             Scaffold(
                 modifier = Modifier,